package com.chenxingnet.tools;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Arrays;

import javax.imageio.ImageIO;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;



/**
 * <p>Title: ImageUtil </p>
 * <p>Description: 使用JDK原生态类生成图片缩略图和裁剪图片 </p>
 * <p>Email: icerainsoft@hotmail.com </p> 
 * @author Ares
 * @date 2014年10月28日 上午10:24:26
 */
public class ImageUtil {

   private Logger log = LoggerFactory.getLogger(getClass());
    
    private static String DEFAULT_PREVFIX = "thumb_";
    private static Boolean DEFAULT_FORCE = false;
    
    /**
     * <p>Title: thumbnailImage</p>
     * <p>Description: 根据图片路径生成缩略图 </p>
     * @param imagePath    原图片路径
     * @param w            缩略图宽
     * @param h            缩略图高
     * @param prevfix    生成缩略图的前缀
     * @param force        是否强制按照宽高生成缩略图(如果为false，则生成最佳比例缩略图)
     */
    public void thumbnailImage(File imgFile, int w, int h, String prevfix, boolean force){
        if(imgFile.exists()){
            try {
                // ImageIO 支持的图片类型 : [BMP, bmp, jpg, JPG, wbmp, jpeg, png, PNG, JPEG, WBMP, GIF, gif]
                String types = Arrays.toString(ImageIO.getReaderFormatNames());
                String suffix = null;
                // 获取图片后缀
                if(imgFile.getName().indexOf(".") > -1) {
                    suffix = imgFile.getName().substring(imgFile.getName().lastIndexOf(".") + 1);
                }// 类型和图片后缀全部小写，然后判断后缀是否合法
                if(suffix == null || types.toLowerCase().indexOf(suffix.toLowerCase()) < 0){
                    log.error("Sorry, the image suffix is illegal. the standard image suffix is {}." + types);
                    return ;
                }
                log.debug("target image's size, width:{}, height:{}.",w,h);
                Image img = ImageIO.read(imgFile);
                if(!force){
                    // 根据原图与要求的缩略图比例，找到最合适的缩略图比例
                    int width = img.getWidth(null);
                    int height = img.getHeight(null);
                    if((width*1.0)/w < (height*1.0)/h){
                        if(width > w){
                            h = Integer.parseInt(new java.text.DecimalFormat("0").format(height * w/(width*1.0)));
                            log.debug("change image's height, width:{}, height:{}.",w,h);
                        }
                    } else {
                        if(height > h){
                            w = Integer.parseInt(new java.text.DecimalFormat("0").format(width * h/(height*1.0)));
                            log.debug("change image's width, width:{}, height:{}.",w,h);
                        }
                    }
                }
                BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
                Graphics g = bi.getGraphics();
                g.drawImage(img, 0, 0, w, h, Color.LIGHT_GRAY, null);
                g.dispose();
                String p = imgFile.getPath();
                // 将图片保存在原目录并加上前缀
                ImageIO.write(bi, suffix, new File(p.substring(0,p.lastIndexOf(File.separator)) + File.separator + prevfix +imgFile.getName()));
            } catch (IOException e) {
               log.error("generate thumbnail image failed.",e);
            }
        }else{
            log.warn("the image is not exist.");
        }
    }
    
    public void thumbnailImage(String imagePath, int w, int h, String prevfix, boolean force){
    	/*  URL m;
          InputStream i = null;
          BufferedInputStream bis = null;
          ByteArrayOutputStream out = null;
          byte isBuffer[] = new byte[1024];
          if (imagePath == null)
              return;
          try {
              m = new URL(imagePath);
              i = (InputStream) m.getContent();

              bis = new BufferedInputStream(i, 1024 * 4);
              out = new ByteArrayOutputStream();
              int len = 0;
              while ((len = bis.read(isBuffer)) != -1) {
                  out.write(isBuffer, 0, len);
              }
              out.close();
              bis.close();
          } catch (MalformedURLException e1) {
              e1.printStackTrace();
              return;
          } catch (IOException e) {
              e.printStackTrace();
          }
          if (out == null)
              return;
          byte[] bfile = out.toByteArray();
    	
    	
          BufferedOutputStream bos = null;  
          FileOutputStream fos = null;  
          File file = null;  
          try {  
              File dir = new File(filePath);  
              if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在  
                  dir.mkdirs();  
              }  
              file = new File(filePath+"\\"+fileName);  
              fos = new FileOutputStream(file);  
              bos = new BufferedOutputStream(fos);  
              bos.write(bfile);  
          } catch (Exception e) {  
              e.printStackTrace();  
          } finally {  
              if (bos != null) {  
                  try {  
                      bos.close();  
                  } catch (IOException e1) {  
                     e1.printStackTrace();  
                  }  
              }  
              if (fos != null) {  
                  try {  
                      fos.close();  
                  } catch (IOException e1) {  
                      e1.printStackTrace();  
                  }  
              }  
          }  
      } 
          
    	
    	
    	File file = new File("");

    	OutputStream output = new FileOutputStream(file);

    	BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);

    	bufferedOutput.write(byt);
    	 */
    
        File imgFile = new File(imagePath);
        thumbnailImage(imgFile, w, h, prevfix, force);
    }
    
    public void thumbnailImage(String imagePath, int w, int h, boolean force){
        thumbnailImage(imagePath, w, h, DEFAULT_PREVFIX, force);
    }
    
    public void thumbnailImage(String imagePath, int w, int h){
        thumbnailImage(imagePath, w, h, DEFAULT_FORCE);
    }
    
    public static void main(String[] args) {
        new ImageUtil().thumbnailImage("d:/20170515172504.jpg", 100, 150);
    }

}